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          神器 Pypandoc —— 实现电子书自由
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        <p>知识就是力量，甚至说 <strong>知识就是金钱</strong> 更为合适。</p>
<p>在信息时代的我们，获取知识，提升认知如同吃饭一样，成为了必须做的事情，阅读是最常用的获取知识的方式，没用之一，可以有时因为一些技术问题，导致我们阅读不便。</p>
<p>比如前几天，我想读一本 《人人都能用英语》，找到了在这里找到了用 Markdown 写的原文，虽然可以阅读，但如何在手机上阅读，是个问题。</p>
<p>转为 Pdf，或者 html，可以是可以，不过阅读起来不方便，也记不住上次读到哪里了，更要命的是无法做笔记，也搜了纸质书，因为这本书没用正式出版，所以也都是盗版的。</p>
<p>因为我经常用 多看APP 读书，如果能直接在多看上看就好了。</p>
<p>尝试了以一圈，发现了一个好方法，现在我以及阅读过半了，现在分享一下我的魔法过程。</p>
<a id="more"></a>
<h2 id="解题思路">解题思路</h2>
<p>首先看看多看支持什么样的电子书格式，百度一下，特别全，为了更好的体验，还是转为 epub 更好。</p>
<p>因为 PDF 没法自适应行，只能通过放大缩小控制。</p>
<p>那么如何转 epub 呢？一搜，发现有众多在线转的，尝试了几个，不是收费就是各种限制。</p>
<p>咱不是会编程吗？如果能自己搞岂不更好。</p>
<p>改变检索思路，很快发现了一个命令行工具 —— <code>pandoc</code>，进一步研究，发现竟然有 Python 版的 —— pypandoc，真是太棒了，研究一番，发现完全满足我的需求。</p>
<p>于是解决方案就是：</p>
<ol>
<li>下载 markdown 版电子书</li>
<li>用 pypandoc 转化为 epub 格式</li>
<li>导入 多看 阅读</li>
</ol>
<h2 id="神奇出场">神奇出场</h2>
<p>之所以喜欢 Python 有一个重要的原因就是安装和使用扩展很方便，几乎每个神器出场的方式都是一样的哈哈</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">pip install pypandoc</span><br></pre></td></tr></table></figure>
<blockquote>
<p>友情提示：<br>
最好创建一个虚拟环境来安装，这样不好影响其他库，也方便迁移，理解和创建虚拟环境可以参考 <a href="https://mp.weixin.qq.com/s/WflK5pOKhvPg8zrf_W5mfw" target="_blank" rel="noopener">https://mp.weixin.qq.com/s/WflK5pOKhvPg8zrf_W5mfw</a></p>
</blockquote>
<p>安装成功之后，可以测试一下：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&gt;&gt;&gt; </span><span class="keyword">import</span> pypandoc</span><br><span class="line"><span class="meta">&gt;&gt;&gt; </span>print(pypandoc.get_pandoc_version())</span><br><span class="line"><span class="number">2.14</span><span class="number">.2</span></span><br></pre></td></tr></table></figure>
<p>可见，我安装的版本是: 2.14.2</p>
<blockquote>
<p>pandoc 是一个常用的软件，很多操作系统比如 Windows 可能已经内置<br>
另外也可以单独安装，使用它的命令行工具，更多的 Pandoc 安装方式 和用法可以参考 <a href="https://github.com/NicklasTegner/pypandoc" target="_blank" rel="noopener" title="Pandoc 说明">Pandoc 说明</a> 和 <a href="https://pandoc.org/index.html" target="_blank" rel="noopener" title="Panddoc 文档">Panddoc 文档</a></p>
</blockquote>
<h2 id="小试牛刀">小试牛刀</h2>
<p>翻看 Pandoc 说明，发现有个 <code>convert_text</code> 方法，可以用字符串的方式提供待转化的文本。</p>
<p>那先写一段 markdown 试试：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> pypandoc</span><br><span class="line"></span><br><span class="line">input = <span class="string">"**Hello World!**"</span></span><br><span class="line">output = pypandoc.convert_text(input, <span class="string">'html'</span>, format=<span class="string">'md'</span>)</span><br><span class="line"></span><br><span class="line">print(output)</span><br></pre></td></tr></table></figure>
<p>显示结果如下：</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">p</span>&gt;</span><span class="tag">&lt;<span class="name">strong</span>&gt;</span>Hello World!<span class="tag">&lt;/<span class="name">strong</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p>太棒了，将 <code>**Hello World!**</code> 转化成了一段 html 代码了。</p>
<p>再试点复杂的：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> pypandoc</span><br><span class="line"></span><br><span class="line">input = <span class="string">"""</span></span><br><span class="line"><span class="string"># Pandoc</span></span><br><span class="line"><span class="string"></span></span><br><span class="line"><span class="string">Pandoc 是个牛X的工具</span></span><br><span class="line"><span class="string"></span></span><br><span class="line"><span class="string">## 用法</span></span><br><span class="line"><span class="string"></span></span><br><span class="line"><span class="string">- `convert_text`</span></span><br><span class="line"><span class="string">- `convert_file`</span></span><br><span class="line"><span class="string">"""</span></span><br><span class="line">output = pypandoc.convert_text(input, <span class="string">'html'</span>, format=<span class="string">'md'</span>)</span><br><span class="line">print(output)</span><br></pre></td></tr></table></figure>
<p>看看输出：</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">h1</span> <span class="attr">id</span>=<span class="string">"pandoc"</span>&gt;</span>Pandoc<span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span>&gt;</span>Pandoc 是个牛X的工具<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">h2</span> <span class="attr">id</span>=<span class="string">"用法"</span>&gt;</span>用法<span class="tag">&lt;/<span class="name">h2</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">ul</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">li</span>&gt;</span><span class="tag">&lt;<span class="name">code</span>&gt;</span>convert_text<span class="tag">&lt;/<span class="name">code</span>&gt;</span><span class="tag">&lt;/<span class="name">li</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">li</span>&gt;</span><span class="tag">&lt;<span class="name">code</span>&gt;</span>convert_file<span class="tag">&lt;/<span class="name">code</span>&gt;</span><span class="tag">&lt;/<span class="name">li</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">ul</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p>换一种输出格式呢？</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">output = pypandoc.convert_text(input, <span class="string">'rst'</span>, format=<span class="string">'md'</span>)</span><br></pre></td></tr></table></figure>
<p>看看输出：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">Pandoc</span><br><span class="line">&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;</span><br><span class="line"></span><br><span class="line">Pandoc 是个牛X的工具</span><br><span class="line"></span><br><span class="line">用法</span><br><span class="line">----</span><br><span class="line"></span><br><span class="line">-  &#96;&#96;convert_text&#96;&#96;</span><br><span class="line">-  &#96;&#96;convert_file&#96;&#96;</span><br></pre></td></tr></table></figure>
<p>最好试试转化为 ePub 格式</p>
<blockquote>
<p>ePub 格式无法输出为字符串，需要存入文件，所以需要用 加入 <code>outputfile</code> 参数</p>
</blockquote>
<p>代码如下：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">convert_test(input, <span class="string">'epub'</span>, format=<span class="string">'md'</span>, outputfile=<span class="string">'test.epub'</span>)</span><br></pre></td></tr></table></figure>
<p>用 EPUB File Reader 打开看看效果：</p>
<p><img src="http://www.justdopython.com/images/2021/09/pypandoc/01.jpg" alt="epub"></p>
<h2 id="生成电子书">生成电子书</h2>
<p>测试了没问题后，就转化一个 Markdown 文件试试。</p>
<p>对于文件，需要用 <code>convert_file</code> 方法：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> pypandoc</span><br><span class="line"></span><br><span class="line">convert_file(<span class="string">'everyone-can-use-english.md'</span>, <span class="string">'epub'</span>, <span class="string">'md'</span>, outputfile=<span class="string">'人人都能用英语.epub'</span>)</span><br></pre></td></tr></table></figure>
<p>很快就能生成一个 epub 格式的电子书。</p>
<p>这里需要注意的是： <strong>引用的图片</strong></p>
<p>如果是网络上的，需要将图片地址换成全网址，如果是相对的，需要保持目录结构，并却提前准备好图片。</p>
<p>不然将无法生成图片，使电子书失去一定的可读性。</p>
<p>生成好了之后，可以将 <code>人人都能用英语.epub</code> 发送到手机上，用多看打开。</p>
<p>看看效果：</p>
<p><img src="http://www.justdopython.com/images/2021/09/pypandoc/02.jpg" alt="多看"></p>
<p>之后就可以在书架里看到了：</p>
<p><img src="http://www.justdopython.com/images/2021/09/pypandoc/03.jpg" alt="多看书架"></p>
<p>简直太棒了，可以安心的读书了！</p>
<h2 id="总结">总结</h2>
<p>今天介绍了 <code>pyPandoc</code> 的简单用法 pyPandoc 不仅帮助我创建了电子书，而且让我理解了 Markdown 转化为 Html 的结果，为进步步打造自己的写作系统奠定了基础。</p>
<p>Pandoc 是个强大的工具，利用好，可以帮助我们实现电子书自由，加上会 Python 编程，就更厉害了。</p>
<p>期望这篇文章对你有用，祝你打造出自己的电子书系统，比心！</p>

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